I build a chroot port databases/mysql50-server:
make package-recursive command
===> Fetching all distfiles for mysql-server-5.0.90 and dependencies
===>  Vulnerability check disabled, database not found
===>  License check disabled, port has not defined LICENSE
You may use the following build options:
	WITH_CHARSET=charset	Define the primary built-in charset (latin1).
	WITH_XCHARSET=list	Define other built-in charsets (may be 'all').
	WITH_COLLATION=collate	Define default collation (latin1_swedish_ci).
	WITH_OPENSSL=yes	Enable secure connections.
	WITH_LINUXTHREADS=yes	Use the linuxthreads pthread library.
	WITH_PROC_SCOPE_PTH=yes	Use process scope threads
				(try it if you use libpthread).
	BUILD_OPTIMIZED=yes	Enable compiler optimizations
				(use it if you need speed).
	BUILD_STATIC=yes	Build a static version of mysqld.
				(use it if you need even more speed).
	WITHOUT_THR_ALARM=yes	Disable signals (this reduces kernel lock
Syntax error: Unterminated quoted string
*** Error code 2
1 error
*** Error code 2

Stop in /usr/ports/databases/mysql50-server.

Fix: Patch attached with submission follows:
How-To-Repeat: build a chroot port databases/mysql50-server:
make package-recursive command